For now I didn't saw any post/thread about this except jolla store. It not so convenient and you not always get answers by this way.
Hope author (hhaveri) will come here and help/answer to us, also help of users are welcome.

It looked interesting but failed at the first use for me. I set it to switch the sound off between 23:00 and 08:00, which it did, but an alarm at 07:15 didn't make a sound.

I've gone back to the Night Silence app.

Just tried it and it works as it should - alarm went off including the sound.

That being said, I am using a testing version which is not yet released, so you might need to wait a few days before it hits the store.

__________________I don't understand why would anyone use a random, insecure, proprietary chatting solution as WhatsApp, when you have so many safe and open alternatives.
Please, don't use it. If this doesn't convince you, read more here.
The worst thing is even if you don't use it, it takes one ***** who does and has your number in his/her contacts and your number is uploaded to servers of this insane company for 'anyone interested' to read.
Thumbs up for everyone supporting WhatsApp on Maemo. NOT

@hhaveri, I noticed that an already known (paired) Bluetooth device does not trigger any situations. I can't even find a device if it is already paired. Still with the latest version.
On a SGS3, this function works.

Thanks for posting a direct link! By the way, this way we could easily have a version that 'autostarts'...